Simplify find_files::FindFilesIter::next with the help of a helper macro

src/main.rs

@@ -39,15 +39,24 @@ fn find_subs(root: &Path, match_str: &OsStr) -> io::Result<Option<PathBuf>> {
     Ok(None)
 }
 
+macro_rules! nested_try {
+    ($ex:expr) => {
+        match $ex {
+            Ok(val) => val,
+            Err(e) => return Some(Err(e)),
+        }
+    }
+}
+
 fn find_files(
     root: &Path,
     extension: &OsStr,
 ) -> io::Result<impl Iterator<Item = io::Result<PathBuf>>> {
-    struct FindFonts {
+    struct FindFilesIter {
         read_dirs: Vec<ReadDir>,
         extension: OsString,
     }
-    impl Iterator for FindFonts {
+    impl Iterator for FindFilesIter {
         type Item = io::Result<PathBuf>;
 
         fn next(&mut self) -> Option<Self::Item> {
@@ -56,22 +65,12 @@ fn find_files(
                     self.read_dirs.pop();
                     continue;
                 };
-                let entry = match next {
-                    Ok(entry) => entry,
-                    Err(e) => return Some(Err(e)),
-                };
-                let file_type = match entry.file_type() {
-                    Err(e) => return Some(Err(e)),
-                    Ok(file_type) => file_type,
-                };
+                let entry = nested_try!(next);
+                let file_type = nested_try!(entry.file_type());
                 if file_type.is_dir() {
-                    match entry.path().read_dir() {
-                        Err(e) => return Some(Err(e)),
-                        Ok(read_dir) => {
+                    let read_dir = nested_try!(entry.path().read_dir());
                     self.read_dirs.push(read_dir);
                     continue;
-                        }
-                    }
                 } else {
                     let path = entry.path();
                     if path.extension().is_some_and(|ex| ex == self.extension) {
@@ -83,7 +82,7 @@ fn find_files(
             }
         }
     }
-    Ok(FindFonts {
+    Ok(FindFilesIter {
         read_dirs: vec![root.read_dir()?],
         extension: extension.to_owned(),
     })